This is just another word for your knee or knee cap. Your knee is in the shape of a triangle, and this helps for your legs to bend and fold while running and walking and riding a bike. Under the knee cap is a tissue called cartilage.

When chlorine, fluorine, bromine, or iodine is attached to a carbon atom. That carbon atom is considered primary if there is only one other carbon that is connected to the carbon that the chlorine, fluorine, bromine, or iodine is attached to.

Primary growth is the growth of the tips of the roots and shoots of a plant. This is to increase the length downwards (into the ground) of the roots, and upwards (out of the ground) of a plant\'s shoots.

Procedural language is a computer programming language that specifies a series of well-structured steps and procedures within its programming context to compose a program. It contains a systematic order of statements, functions and commands to complete a computational task or program.